Ball screw for a motor vehicle brake and a motor vehicle brake

Abstract

The invention relates to a ball screw for a motor vehicle brake, in particular for an electromechanically actuable motor vehicle brake, comprising a rotatable spindle; a nut that is axially movable relative to the spindle in accordance with the rotation thereof; and rolling body arrangement that is disposed between, and displaceable relative to, the spindle and the nut. In this ball screw it is provided that the rolling body arrangement is preloaded into a predetermined normal position by means of at least one spring element. The invention further relates to a vehicle brake having such a ball screw.

1. Ball screw for a motor vehicle brake comprising
 a rotatable spindle, 
 a nut that is axially movable relative to the spindle in accordance with the rotation thereof and 
 a rolling body arrangement that is disposed between, and displaceable relative to, the spindle and the nut, 
 wherein the rolling body arrangement is preloaded into a predetermined normal position by means of at least one spring element disposed outside of the rolling body arrangement, the at least one spring element disposed outside of the spindle and wherein the nut is connected in a fixed manner to a threaded bush having track grooves for the rolling body arrangement. 
 
     
     
       2. Motor vehicle brake comprising a brake lining that is displaceable relative to a housing, a motor drive, and a displacement mechanism disposed between the brake lining and the motor drive, wherein the displacement mechanism comprises a ball screw according to  claim 1 . 
     
     
       3. Motor vehicle brake according to  claim 2 , wherein the spindle of the ball screw is rotatable by means of the motor drive. 
     
     
       4. Motor vehicle brake according to  claim 2 , wherein the motor drive comprises a gear arrangement. 
     
     
       5. Ball screw according to  claim 1 , wherein the rolling body arrangement comprises a bush-like rolling body cage. 
     
     
       6. Ball screw according to  claim 5 , wherein the bush-like rolling body cage extends between the spindle and the spring element. 
     
     
       7. Ball screw according to  claim 1 , wherein the at least one spring element takes the form of a preloaded tension spring, a compression spring or a torsion spring. 
     
     
       8. Ball screw for a motor vehicle brake comprising
 a rotatable spindle, 
 a nut that is axially movable relative to the spindle in accordance with the rotation thereof and 
 a rolling body arrangement that is disposed between, and displaceable relative to, the spindle and the nut, 
 wherein the rolling body arrangement is preloaded into a predetermined normal position by means of at least one spring element disposed outside of the rolling body arrangement, the at least one spring element disposed outside of the spindle; 
 wherein the rolling body arrangement comprises a bush-like rolling body cage; 
 wherein the bush-like rolling body cage extends between the spindle and the spring element. 
 
     
     
       9. Motor vehicle brake comprising a brake lining that is displaceable relative to a housing, a motor drive, and a displacement mechanism disposed between the brake lining and the motor drive, wherein the displacement mechanism comprises a ball screw according to  claim 8 . 
     
     
       10. Motor vehicle brake according to  claim 9 , wherein the spindle of the ball screw is rotatable by means of the motor drive. 
     
     
       11. Motor vehicle brake according to  claim 9 , wherein the motor drive comprises a gear arrangement. 
     
     
       12. Ball screw according to  claim 8 , wherein the nut is connected in a fixed manner to a threaded bush having track grooves for the rolling body arrangement. 
     
     
       13. Ball screw according to  claim 8 , wherein the at least one spring element takes the form of a preloaded tension spring, a compression spring or a torsion spring.